I don't disagree with you that the delays and refusals by the IRS to grant Tea Party groups tax exempt status interfered with the funding and hence the capability of organizing voters by these organizations, but I don't know if I would use the term "stolen" to describe these effects, as disgusting as they were.
More important, though, to the outcome, was the outright fraud and cheating in defiance of election laws engaged in by the 'Rats and their affiliated groups, and targeted to the swing states. Aside from the more traditional election fraud and cheating techniques (ineligible and dead voters voting, voters voting multiple times at multiple locations (aided and abetted by keeping the polls open for many days, i.e., "early voting"), voting for the physically and mentally handicapped, voting both absentee and in person, voting in more than one state, there were deliberate errors in vote counting working to Obama's favor (e.g., Zero votes reported for Romney in quite a number of predominantly black election districts in places like Philadelphia and Cleveland) and electronic hacking of voting equipment such as optical scanners and touch screens to rig the tally in Obama's fever.
So even with the reduced presence of the Tea Party groups, we should not neglect or forget the 'Rat cheating and fraud at the polling places that could very well have been the decisive factor for Obama last year. That's where the real stealing likely occurred.
Across the country they were stolen in city after city and I mean towns of 30k that call themselves cites !