You have helped us kick-off the general election on the strongest footing of any presidential challenger ever.
The first prolonged and impassioned controversy in the Congress involving a pure food issue took place in 1886, pitting the reigning champion, butter, against a challenger, oleomargarine.
There is an initial reluctance to admit that there is much to fret about, and there is the arrival of a challenger (or several challengers) to the settled international order.
Barack Obama is not facing a primary challenger from his own party but he almost did.
The duel usually developed out of the desire of one party (the challenger) to redress a perceived insult to his honor.
To them, he symbolized something very different: a youthful challenger who was crushed by a reactionary status quo. His arrest, they said, was a warning to all of them not to rock the boat.
Instead those disparate groups of discontented Iranians united behind the main challenger, Mr Mousavi.
MAHMOUD AHMADINEJAD, Iran's President, faces a disgruntled people, an election in June, and now a strong new challenger for his job.
Mr Lukashenka’s main challenger was badly beaten by riot police.
For fans, it helps to explain why a win by a No. 1 seed over an unranked challenger is no big deal, while underdog victors like the 1980 U.S. Olympic hockey team are so electrifying.
And China's sheer size makes it a more plausible challenger than a relatively small nation, such as Japan.
The world champion was dethroned in the third round of the match by a young challenger.
In 1980, when voters were weary of Jimmy Carter but worried that his challenger might be an extremist, Ronald Reagan's amiable performance reassured them.
But this is a challenger they've never seen.
The second challenger is a heavyweight.