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Racial Redistricting and Minority Representation
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2
TRIANGLES: DISTRICTING MADE SIMPLE(X)
9
WD
R
BD
White Dem
Wins
Rep Wins
Black Dem
Wins
Rep wins without strategic voting;White Dem wins with strategic voting
Figure 6: Region in which strategic voting in the primary can affect theelection winner
WD
R
BD
Increasing
π
BD
Constant
π
BD
White Dem
Wins
Rep Wins
Black Dem
Wins
Figure 7: Analysis of election winners
figure shows, this can allow a black democrat to win the primary, and thenthe general, whereas a white democrat would have won before. So supposedlyconservative shifts in districting can aid minority constituents.
The other diagonal line moves straight towards the BD corner, so it rep-
resents adding more black voters to a district while keeping the ratio of WDto R voters constant. Again, the impact is non-monotonic. We first movefrom a situation where a republican wins, to a white democrat, back to arepublican, and finally to a black democrat. So a pro-minority shift canhave adverse consequences if the entire district composition is not taken intoaccount.
3
3
This non-monotonicity requires some degree of sincere voting; if all voters were so-
phisticated, then the line could not re-enter the Republican region.
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2
TRIANGLES: DISTRICTING MADE SIMPLE(X)
9
WD
R
BD
White Dem
Wins
Rep Wins
Black Dem
Wins
Rep wins without strategic voting;
White Dem wins with strategic voting
Figure 6: Region in which strategic voting in the primary can affect the
election winner
WD
R
BD
Increasing
π
BD
Constant
π
BD
White Dem
Wins
Rep Wins
Black Dem
Wins
Figure 7: Analysis of election winners
figure shows, this can allow a black democrat to win the primary, and then
the general, whereas a white democrat would have won before. So supposedly
conservative shifts in districting can aid minority constituents.
The other diagonal line moves straight towards the BD corner, so it rep-
resents adding more black voters to a district while keeping the ratio of WD
to R voters constant. Again, the impact is non-monotonic. We first move
from a situation where a republican wins, to a white democrat, back to a
republican, and finally to a black democrat. So a pro-minority shift can
have adverse consequences if the entire district composition is not taken into
account.
3
This non-monotonicity requires some degree of sincere voting; if all voters were so-
phisticated, then the line could not re-enter the Republican region.
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