What did Congress prevent in Gujrat is not clear. They did not make Sikh a PM. They have made Sikh a dummy PM, without any power whatsoever. All power is in the hands of Sonia parivar.
BJP or Congress, both have right to come to power with their allies. But Congress & Left r each others' only enemy in WB, Tripura and Keral. Allies generally r those, who form pre poll alliance. Present govt was formed with post poll alliance between warring parties.
I do not have anything to say about BJP supporters. I vote as per my conscience. I had been voting Congress, Left and BJP in different elections. Internal democracy was killed in Congress by Indira in 1975.