WP political blog, "The Fix," by Chris Cillizza
....Remember that the number one race on the Line is the most likely to switch parties on Nov. 7....
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4. Indiana's 8th District (R): Most Republicans we talk to think Rep. John Hostettler's (R) time is up. Never one to raise money or run modern campaigns, Hostettler has always gotten by on the strength of his grassroots organization in this southern Indiana district. But we hear Vanderburgh County Sheriff Brad Ellsworth has a wide lead in internal polling, and this one may be all but over. (Previous ranking: 5)
3. Arizona's 8th District (R): Expect this race to move into the top two (or even claim the number one slot) if former state Rep. Randy Graf wins the Republican primary on Sept. 12. National Republicans held out some hope that moderate state Rep. Steve Huffman might be able to defeat Graf, but the Democratic Congressional Campaign Committee smartly began running television ads attacking Huffman's credentials on illegal immigration -- a move that likely ended his chances. Former state Sen. Gabrielle Giffords should win the Democratic nod. (Previous ranking: 4)
2. Iowa's 1st District (R): The first two races on the Line should truly be ranked "1" and "1-A," as there is very little difference between the two. Voters in this district have elected Rep. Jim Nussle (R) for the past sixteen years. (This cycle Nussle is retiring from Congress and running for governor.) But the Democratic presidential candidate carried the district in 2000 and 2004, and it looks as if it will return to its normal voting pattern. Attorney Bruce Braley (D) is the likely beneficiary. (Previous ranking: 2)
1. Colorado's 7th District (R): The Democratic Congressional Campaign Committee is already pummeling Republican Rick O'Donnell (R) over an article he wrote advocating the dissolution of Social Security. O'Donnell is hoping to gain some traction by hitting former state Sen. Ed Perlmutter (D) for his refusal to rule out a path to citizenship for illegal immigrants, but it's an uphill fight. (Previous ranking: 1)
http://blog.washingtonpost.com/thefix/2006/09/the_house_line_potential_surpr.html#more