Eminem believes he could have cost US Presidential candidate John Kerry the 2004 election.The outrageous rapper released his anti-Bush single 'Mosh' just before America voted in November 2004 in a bid to whip up resentment against the president.However, the outspoken star believes he could have won Kerry enough vital votes to swing the election in his favor if he released the controversial track sooner. He said: 'I do have a bit of regret about that. We did ot best to get it out as soon as we could. But do I wish I could have gotten it out two weeks...