By Adriana Barrera MEXICO CITY (Reuters) – Mexican congressional committees on Monday gave the green light to an electoral reform demanded by the opposition, paving the way for lawmakers to push ahead with the energy sector overhaul at the center of President Enrique Pena Nieto's reform agenda. The reform will allow federal lawmakers to serve consecutive terms, sets out rules for coalition governments and should strengthen Congress at the expense of the president. It is the last major hurdle to approval of the energy reform. The progress on the electoral bill comes after Mexico's main leftist party pulled out of a political pact that Pena Nieto's ruling Institutional Revolutionary Party (PRI) forged a year ago with opposition leaders to push through economic reforms.