Mike Castle (Getty Images/Chip Somodevilla)

Delaware Republican Rep. Michael N. Castle has $861,000 in his House campaign fund — money that he could use for a U.S. Senate campaign he is still contemplating.

Castle, Delaware’s sole House member, made the disclosure in a second-quarter filing Monday with the Federal Election Commission two days before a July 15 deadline that applies to all members of Congress and candidates.  

Castle raised $125,000 during the reporting period , most of it from political action committees (PACs) and just $14,600 from individual donors. He actually raised more money, $186,000, in the second quarter of 2007 , a majority of it from individual donors.