Changing Congress 1.Elections. The 111 th Congress.
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Transcript of Changing Congress 1.Elections. The 111 th Congress.
Changing Congress
1. Elections
The 111th Congress
The 112th Congress
111th Congress258 Democrats
112th Congress193 democrats
111th 112th
The Congress (=House of Representatives)
435 Representatives since the Apportionment Act of 1911
Irrespective of population growth
Changing Congress
1. Redistricting in response to population change
The population of Texas increased by 25% between 2000 and 2010 –
from 20 million to 25 million
One Person, One Vote: The Equal Population Requirement
112th Congress, 32
seats
San Antonio
Austin
Houston
113th Congress, 36 seats
Minority Vote Dilution and
Section 2 of the Voting Rights Act
Census Block Groups
Texas_BGs
HISPANIC / POP2010
0.000000000 - 0.1500
0.1501 - 0.2856
0.2857 - 0.4476
0.4477 - 0.6350
0.6351 - 0.8304
0.8305 - 1.000
Census Block Groups
Texas_BGs
HISPANIC / POP2010
0.000000000 - 0.1500
0.1501 - 0.2856
0.2857 - 0.4476
0.4477 - 0.6350
0.6351 - 0.8304
0.8305 - 1.000
Redistricting ProcessGeneral Redistricting Principles
• One person, one vote• Minority voting rights• County line rule for house districts• Contiguity• Compactness
Counties (containing VTDs) by color with 112th Congressional districts in outline
Counties (containing VTDs) by color with 112th Congressional districts in outline
• Contiguity• Compactness
Gerrymandering
22
Census Block Groups
Texas_BGs
HISPANIC / POP2010
0.000000000 - 0.1500
0.1501 - 0.2856
0.2857 - 0.4476
0.4477 - 0.6350
0.6351 - 0.8304
0.8305 - 1.000
Census datafield example
FID 4848
ObjectID 5697
STATE_FIPS 48code for the state according to Federal Information Processing Standards
CNTY_FIPS 61
STCOFIPS 48061
TRACT 12504
BLKGRP 2
A census block group is a geographical unit used by the United States Census Bureau which is between the census tract and the census block. It is the smallest geographical unit for which the bureau publishes sample data, i.e. data which is only collected from a fraction of all households.
FIPS 480610125042
POP2000 2667
POP00_SQMI 962.8
POP2010 11659
POP10_SQMI 4209
WHITE 10334
BLACK 73
AMERI_ES 63American Eskimo
ASIAN 138
HAWN_PI 0Hawaaian Pacific Islander
HISPANIC 10629
OTHER 884
MULT_RACE 167multiple races
MALES 5574
FEMALES 6085AGE_UNDER5 1170
AGE_5_9 1311
AGE_10_14 1333
AGE_15_19 1015
AGE_20_24 662
AGE_25_34 1831
AGE_35_44 1740
AGE_45_54 1211
AGE_55_64 824
AGE_65_74 331
AGE_75_84 189
AGE_85_UP 42
MED_AGE 27median age
MED_AGE_M 24.5
MED_AGE_F 29
HOUSEHOLDS 3022A household consists of all people who occupy a housing unit regardless of relationship.
AVE_HH_SZ 3.86average household size
HSEHLD_1_M 91households w/ 1 male
HSEHLD_1_F 130households w/ 1 female
MARHH_CHD 1459married households w/ children
MARHH_NO_C 539married households no children
MHH_CHILD 93male household w/ children
FHH_CHILD 485female household w/ children
FAMILIES 2745
A family consists of two or more people (one of whom is the householder) related by birth, marriage, or adoption residing in the same housing unit.
AVE_FAM_SZ 4.04
HSE_UNITS 3153housing units
VACANT 131
OWNER_OCC 2553owner occupied
RENTER_OCC 469renter occupiedSQMI 2.77
Voting tabulation districts 2008 Presidential Election
Texas_VTD
Pres_R_08 / Pres_D_08
0.000000000 - 0.4013
0.4014 - 0.8823
0.8824 - 1.554
1.555 - 2.443
2.444 - 3.625
3.626 - 80.00
VTD – Voting Tabulation Districts
Election data
• The Voting Tabulation DistrictVoting precincts become TVTDs
Precinct 1
Precinct 3
Prec
inct
4
Prec
inct
2VTD 1
VTD 3VT
D 4
VTD
2
Results of Change
• Consistent geography for apples-to-apples demographic comparisons over time
• Integrates elections & voter information with census geography– VTD boundaries = tabulation block boundaries
Voting Tabulation
District Data
field examplesFID 4844CNTYVTD 570002 County voting tablulation districtCNTY 57COLOR 1VTDKEY 1210 VTD identifierCNTYKEY 29VTD 2Shape_area 2354195.33Shape_len 7506.5651NV_D 369.3068Normal vote for Ds over many electionsNV_R 151.6932Normal vote for Rs over many electionsGov_D_02 357 Governor’s race Democratic voteGov_R_02 100Pres_D_04 312 President’s race Democratic votePres_R_04 230Gov_D_06 198Gov_R_06 68Pres_D_08 334Pres_R_08 187Gov_D_10 164Gov_R_10 102vap 1427 Voting age population
Texas Redistricts based on the 2010 US Census
Plan C185
• June 20 2011 plan put forward by Texas Legislature
• See the lab for the shapefile• One example: Lloyd Doggett
The restructuring of selected districts under C185 (the state legislature’s plan)
Plan C220
• November 26, 2011 plan announced by the US District Court for the Western District of Texas.
• This was vacate by the US Supreme Court on January 20, 2012
• See the lab for the shapefile
C185 Black linesC220 Red lines
Plan C235
• The interim congressional plan ordered by the Western District Court
C185 Black linesC235 Purple lines