Capitol Hill employees owed $9.3 million in overdue taxes at the end of last year, a sliver of the $1 billion owed by federal workers nationwide but one with potential political ramifications for members of Congress. The debt among Hill employees has risen at a faster rate than the overall tax debt on the government's books, according to Internal Revenue Service data. It comes at a time when some Republican members are pushing for the firings of government workers who owe the IRS and President Obama has urged a crackdown on delinquent government contractors.