Yes, you can change your vote with the Split Government Party

"Can I Change My Vote": Voter's Remorse Sets In As Searches For Do-Over Spike

As the political leader of Anarchism USA, may I promote the Split Government party. 

The spit government party will throw the presidential election to the party opposite the House controlled party.  We can do this because the electoral college happens after we know the outcome of House races. So, effectively the Anarchists can generate 1.5 votes per ballot cast. A remarkable feat.