CARACAS, Venezuela — Ramón Guillermo Aveledo has been something of chief herder of cats for Venezuela’s political opposition, cajoling, arm-twisting and pleading to keep a contentious gaggle of parties all across the political spectrum from going their separate ways.

His job is not about to get any easier.

Battered by the re-election of President Hugo Chávez this month, Venezuela’s fractious opposition is struggling to remain united and rally its followers for crucial elections for governors in December.

“There is nothing to suggest we would do better apart than together,” said Mr. Aveledo, the executive secretary of the opposition coalition, known as the Democratic Unity Table, which backed Mr. Chávez’s challenger, Henrique Capriles Radonski.

Mr. Chávez, who has been in office for almost 14 years, was re-elected Oct. 7 with 55 percent of the vote, compared with 44 percent for Mr. Capriles. It was the best showing by the opposition in a presidential election since Mr. Chávez first came to office in 1999.