One memory I have is of watching President Vicente Fox addressing the nation. For 71 years, the PRI party was in power in Mexico. However, in 2000, the conservative party--PAN--took over. While President Fox was delivering his speech, many of the government officials present were standing with their backs facing the President. Others held up signs that said PRI. I found this behavior shocking since such incidents didn't happen when the US President delivered his state of the union.
Since 2000, Mexico has been run by the PAN party. However, Mexico just had an election yesterday. Their new, young president, Enrique Pena Nieto of PRI, won the election. After a 12 year hiatus, PRI is back in power.