To begin, Kundera asserts that kitsch is an aesthetic ideal "in which shit is denied and everyone acts as though it did not exist". He's not just speaking literally here, but about all the bad, disgusting, negative, violent, depressing things in the world. "Kitsch excludes everything from its purview which is essentially unacceptable in human existence".
Kundera then moves on to politics. "Kitsch is the aesthetic ideal of all politicians and all political parties and movements," he says. He gives the example of politicians kissing babies as the ultimate kitschy political move.