WASHINGTON, D.C. -- Minnesota Sen. Mark Dayton's campaign committee spent most of the $440,000 it raised last year, and the freshman Democrat reached the midpoint of his term with $111,832 in cash, his latest campaign finance report showed. Rep. Mark Kennedy, R-Minn., a possible challenger to Dayton in a 2006 Senate campaign, raised $657,718 in 2003 and ended the year with $458,610 in cash.Lawrence Jacobs, a University of Minnesota political scientist, said Dayton's year-end report to the Federal Election Commission "raises a question . . . about how well equipped he is to run for reelection." "This is the time...