Another poll; another Democratic incumbent down big. Just a few days after Reps. Vic Snyder (D-Ark.) and Steve Driehaus (D-Ohio) saw themselves trailing by 17 points apiece in polling conducted for a Democratic-leaning blog, a Republican poll shows freshman Rep. Mark Schauer (D-Mich.) down by nine. The National Research Inc. poll, conducted for former Rep. Tim Walberg's (R-Mich.) campaign, has Walberg leading Schauer 46-37, and 50-40 with "leaners." Another, lesser-known Republican, Brian Rooney, trails Schauer 39-31 in the poll. Rooney is the brother of another freshman congressman, Florida's Tom Rooney (R). President Obama is at 48 percent approval in the...