Delaware Republican Rep. Michael N. Castle didn’t raise much money in this year’s third quarter, but he has substantial surplus campaign funds that he can use for his just-announced Senate campaign.

Castle raised just $57,600 in the months of July, August and September, according to a report his House campaign committee filed Thursday with the Federal Election Commission. Nearly all of Castle’s third-quarter take came from political action committees and just $1,950 came from individual donors.

But Castle began October with $853,000 left in his campaign account, and he is permitted to use all of those funds on a Senate race in a state where waging a top-flight statewide campaign is not prohibitively expensive.