Congress requires states to draw single-member districts.
From Thomas E. Mann
While Republican voters have remained universally supportive of their President, Democrats and Independents are returning to a more naturally critical stance.
Second, the President's popularity has not translated into increased support for the Republican party or for the policies and approaches on domestic policy championed by the President.
The increase in straight-ticket party voting in recent years means that competitive congressional races can tip one way or the other depending on the showing of the candidates at the top of the ticket.
In the House, Republican prospects have been buoyed by several successful rounds of redistricting, which have sharply reduced the number of competitive seats and given the Republicans a national advantage of at least a dozen seats.
Partisanship particularly increased after the 1994 elections and then the appearance of the first unified Republican government since the 1950s.
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