Political observers say it's Barack Obama versus Hillary Clinton on the Democratic side, and Mike Huckabee against John McCain on the Republican side.

And starting with the Democrats --- it's endorsements and surrogates that is defining the race this week. David Wilhelm, Bill Clinton's 1992 campaign manager, is endorsing Obama for president. Wilhelm is also a former chair of the Democratic National Committee and most importantly is a Superdelegate to the party's convention this summer, meaning he can cast an all important vote for Obama.

"The best candidate in the general election is Barack Obama... For the following reasons: First of all, he wins in head-to-head match-ups with Senator McCain. Secondly, he has proven in primary after primary that he can attract the votes of independents" Wilhem said.

Coming off Super Tuesday, Clinton raised 10 million dollars, but earlier this week tough results in the primaries of Virginia, Maryland, and Washington D.C. Clinton's hoping to regain momentum from Tuesday's primary losses to Obama with good showings next month in Ohio and Texas.

Clinton also tried to invigorate her campaign by shaking up the staff. Clinton's campaign manager and deputy campaign manager resigned this week,but Clinton's campaign spokesman says all campaigns will have ups and downs.

"We're ahead as we sit here speaking in the delegate count and the popular vote. Both candidates as strong candidates. They'll have their ups and downs. They're both continue picking up delegates" Doug Hattaway, Clinton Campaign Spokesman said.

Obama laid out his full economic agenda this week with a detailed address after touring a GM plant in Wisconsin -- a state where he's doing lots of campaigning ahead of next week's Tuesday primary. Obama says he'll push for middle class tax cuts and a plan to create 5 million jobs by developing "green" energy sources.

"I'll change our tax code so that it's simple, fair, and advances opportunity, not the agenda of the special interests. I am the only candidate in this race who's proposed a genuine middle-class tax cut that will provide relief to 95% of working Americans" said Obama.

Clinton is scheduled to tour a GM plant in Ohio this morning. She's also planning a rally tonight at Ohio State University and one tomorrow at a Cleveland High School. But it was a speech in Texas where she fine-tuned her criticism of Obama.

McCain is the front-runner among the Republicans. And for the first time, following this Tuesday's primaries -- which he swept -- McCain publicly said he'd prefer if Mike Huckabee drop out, but that he had every right to stay in.

"I appreciate the fact that Governor Huckabee is still in this race. He is a man of integrity, and he has every right to continue this race for as long as he wants to, and I will respect that" said McCain.

"Of course I'd like for him to withdraw today" McCain also stated. "I mean, it would be much easier."

McCain also circulated a memo showing it was mathematically impossible for Huckabee to win the nomination.

Huckabee has said repeatedly that nobody has won the Republican nomination until they've secured the minimum number of needed delegates. He says he continues his campaign and the hunt for more delegates.

"The nomination is not secured until someone has 1,191 delegates. That has not yet happened. And we're still continuing to work and to give voters in these states a choice" said Huckabee.

Huckabee is scheduled to campaign in Wisconsin through tomorrow morning, then he'll head to the Cayman Islands to make a paid speech.He says he has to make money like everyone else, saying he's got a mortgage payment too.