MIAMI, Fla. — Mitt Romney's campaign took a hard line with the Spanish-language network Univision, making last-minute demands in the run-up to last week's town hall that helped insure his success in the forum, sources familiar with the broadcast told BuzzFeed.

When the Republican took his place Wednesday night in the first of two back-to-back candidate forums televised on the mega-network, he was greeted by an adoring, raucous crowd that cheered his every word, and booed many of the moderators' questions. The next night, President Obama was treated to stone cold silence from the audience as he was aggressively grilled on his lackluster immigration record.

The contrast was widely noted by observers who watched both forums — and it was glaring enough to evoke some boasting from the Romney campaign in the immediate aftermath.

"These forums are going to be watched by more Hispanics than watched the conventions," said Alberto Martinez, a Florida-based Romney adviser. "I think [Romney] did an amazing job, and I think it was pretty clear there wasn't the same excitement for President Obama."

But the enthusiasm gap may have been an optical illusion formed by a series of last-minute demands by the Romney campaign, according to Maria Elena Salinas, one of the Univision anchors who moderated the forums.