U.S. Rep. Joe Hoeffel, D-Montgomery, is exploring a challenge to U.S. Sen. Arlen Specter's 2004 re-election bid. Hoeffel, who was elected in a Republican-leaning district in a series of expensive, targeted, high-profile elections, said, "I'm taking a look at it, looking at some polling data that shows the senator is vulnerable. "I have some more people to talk to, some more issues to consider," the Abington Twp. Democrat said. "It's a little premature to talk about this, people are talking to me about running, but my current plan is to run for re-election to Congress." Specter, a Republican, has an...