Dude - you can - this is America. Wait! You are in Canada. What do you want to petition up there?
Anyway - 100,000 people - not even anywhere near a percent of the population have started to petition from all over the country. Why the White House is even going to bother addressing Texas is beyond me - but whatever.
It seems everyone around the world is getting a kick out of it though... sigh.
BBC News - US election: Unhappy Americans ask to secede from US