Pennsylvania Republican Sen. Arlen Specter badly trails primary challenger Patrick J. Toomey, according to a Rasmussen Reports poll 13 months before GOP voters will choose their Senate nominee. The survey, taken of 490 likely Republican voters on April 21, had Toomey leading Specter by 21 percentage points, 51 percent to 30 percent. Forty-two percent of respondents said that they had either a "very favorable" or "somewhat favorable" impression of Specter, compared to 55 percent of Republicans who said they had "somewhat unfavorable" or "very unfavorable" feelings about the senator. The comparable numbers for Toomey, a former House member from Pennsylvania's...