Republican Michael N. Castle has taken a 15-point slide and now trails Delaware Attorney General Beau Biden in a hypothetical matchup for the 2010 election to fill the Senate seat vacated by Biden's father, Joseph R. Biden Jr., according to a poll conducted Nov. 10-15 by Susquehanna Polling and Research, Inc.,
The poll shows Biden now leading Castle 45 percent to 40 percent, with 8 percent undecided and 6 percent saying they would vote for someone else.
In a Susquehanna poll in April, Castle was leading Biden 55 percent to 34 percent.
Susquehanna said Biden picked up support among independent voters and theorized that Castle's support may have declined because of his vote in the House against a bill overhauling the nation's health care system that was supported by the Obama administration and Democrats in Congress. Castle cast that vote during the week before the poll was taken.
The poll was based on automated telephone contact with 850 likely voters in Delaware and carries a margin of error of plus or minus 3.36 percent.
CQ Politics currently rates the race Leans Republican
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