While national polls consistently show Democratic Sen. Barack Obama leading Republican Sen. John McCain in the presidential race — anywhere from 2 percent to 15 percent — federal employees who will be working under the next commander-in-chief are decidedly less certain. According to an unscientific poll currently running on the Federal Times website, Obama and McCain are tied at 45 percent of the vote.  More than 2,000 readers have responded as of Wednesday morning. Among the remaining respondents, 5 percent are undecided and another 2 percent say they plan to vote for another candidate. Perhaps most interestingly, 3 percent say they don’t plan to vote…