Republicans are hopeful that they can improve their chances of retaking the House following redistricting in 2010, just as they used redistricting to solidify their majority in 2000.
Republicans could benefit due to the move of people towards states Republicans used to dominate, especially if we see the usual gains for the party out of power in off year elections.
On the other hand this might not work out well for Republicans if current trends continue. Gallup shows an overwhelming advantage for Democrats in party identification in most states. The poll found that “only five states had solid or leaning Republican orientations in 2008, with Utah, Wyoming, Idaho, and Alaska in the former group, and Nebraska in the latter.” Click on above map for larger version showing the shrinking of red America.