they indeed can... one time a few years back they switched president three times in three days...
chavez some other dude chavez

then ecuador had el loco
peru had the crazy japanese guy
mexico had the pri
paraguay had strossener
pinochet in chile
the list goes on...

Latin American is colourful but not so much when you live there and they screw up all your savings....

if i ever see Salinas (ex Mexican president) i am going to beat him till he gives me some money!