Romney attends fight between Manny Pacquiao and Juan Manuel Marquez in Las Vegas

Just over a month on from his conclusive election night knockout by Barack Obama, defeated Republican candidate Mitt Romney took up ringside seats to see Manny Pacquiao sensationally defeated by Juan Manuel Marquez in Las Vegas.

Despite the political bruising inflicted by his Democratic opponent on November 6th, Romney showed that his appetite for a fight has not been diminished as he watched Marquez, 39, knock out Pacquiao, 33, in the sixth round.

Attending with wife Ann, Mitt Romney was a guest of the Nevada State Athletic Commission chairman Bill Grady at the MGM Grand hotel arena as they witnessed the fourth contest between the two welterweights.

Former Republican presidential candidate Mitt Romney, (left), and wife Ann sit near ringside prior to a welterweight fight between Juan Manuel Marquez and Manny Pacquiao title in Las Vegas

Before the fight Romney visited Pacquiao in his dressing room, wishing him well in the bout.

'Hello Manny. I ran for president. I lost,' Romney said to the fighter, according to Pacquiao publicist Fred Steburg.

In front of television cameras a smiling Romney said 'I wish you good luck tonight,' to Pacquiao, who has won world titles in an unprecedented eight weight divisions. 'Have a great night. Good to see you.'

The Romneys arrived during the undercard, drawing little reaction from the crowd.

But in the sixth round Juan Manuel Marquez knocked Manny Pacquiao out cold with a vicious right hand at the end of the sixth round Saturday night, putting a ferocious end to the fourth fight between the two boxers.

Pacquiao had been down in the third round but knocked Marquez down in the fifth and the two were exchanging heavy blows in the sixth round before Marquez threw a right hand that flattened Pacquiao face down on the canvas at 2:59 of the sixth round.

The referee waved the fight to an end as Marquez celebrated and the sold-out crowd at the MGM erupted. Pacquiao was down for about two minutes before his handlers managed to get him up.

While Pacquiao will hope that he left nothing in the locker room despite his defeat it emerged that Romney had $25.7 million left in the bank days after the November 6th election.

Former Republican presidential candidate Mitt Romney, (center), joined by wife Ann, (right), talks with an unidentified spectator at ringside

President Barack Obama defeated the Republican candidate following a campaign that cost more than $2 billion overall.

Obama's re-election effort had $14.2 million left as of November 26th, according to the Federal Election Commission disclosures.

Leftover campaign cash is common and often goes to the national party or other candidates.

The Romney campaign on Thursday said every raised dollar had gone toward Romney's run and that it 'continues to process invoices for pre-election expenses.'

Manny Pacquiao lays face down on the mat after being knocked out in the sixth round by Juan Manuel Marquez during their welterweight bout at the MGM Grand Garden Arena in Las Vegas

It expected to have less than $1 million by the end of the year.

'It is not uncommon. It is of course a great risk,' said Sheila Krumholz, executive director of the Center for Responsive Politics that tracks campaign finance. 'As a loser you want to make sure you've given it your all.'

Obama and Romney both spent much of their campaign cash on voter outreach and especially advertising. But the Democrat and his "Super PAC" backers at Priorities USA Action, an unlimited-spending group, held an early advertising game advantage.

Obama's campaign dominated the airwaves, booking the increasingly expensive spots earlier and at the lowest price.

The 'super"' political action committee, which was legally barred from coordinating with the campaign, ran a series of aggressive ads about Romney's private equity past that portrayed him as a corporate raider.

The damaging ads, as well as negative press surrounding Romney's disparaging '47 percent' comment about Americans relying on govement funds, contributed to the candidate's defeat.