SIOUX CITY, Iowa -

Mitt Romney running mate Rep. Paul Ryan said the presidential race "is within our grasp" but pleaded with Iowa voters for their help during two rallies held 16 days before Election Day.

The Republican vice presidential nominee spoke before two energetic crowds of nearly 800 people in Sioux City and a similar-sized crowd in Council Bluffs on Sunday, the same day a new national poll was released that shows the race for the White House in a dead heat.

"We need your help. Iowa you are so used to it. You are used to being the eye of the storm. You are used to seeing this. You have a responsibility and an opportunity and an obligation to help us get this country back on the right track so that we look back on this moment as when we reclaimed our freedoms, when we got our jobs back, when we got our economy growing," Ryan said in Council Bluffs.

"This is within our grasp," the Wisconsin lawmaker continued, "So Council Bluffs, Cornhuskers, Hawkeyes, and everybody in between, even my fellow Packers fan and Badgers fan, which I see a few of you in the audience - OK, maybe four."

Both campaigns are making a push for the state's six key electoral votes, which President Barack Obama won in 2008 with a sizable 10-point lead over his Republican opponent, Arizona Sen. John McCain.

Vice President Joe Biden paid a visit to Council Bluffs on October 4, which marked his sixth visit to the Hawkeye state. He made an impromptu stop at a Hy-Vee store and held a rally that had a smaller turnout than Ryan's event outside the Bass Pro Shops, but it is an area that McCain won four years ago.

It was Ryan's first time campaigning through western Iowa since he joined the Republican ticket on August 11 but the he has made a number of trips to the state, including a bus tour across eastern Iowa, where his wife Janna's family is from, in early October.

CNN reported last week that, in Iowa, more than half of the 450,000 absentee ballots requested have been returned. Democrats lead the pack, requesting more than 200,000 ballots and returning almost 65% of those. Republicans requested almost 140,000 and returned just less than 60%. Ballots requested with no party affiliation or for other party affiliations total about 105,000 and 50% of those have been returned.

In Iowa on Sunday, Ryan did not specifically ask anyone to vote early, but in Sioux City the Republican vice presidential hopeful reminded them of the promises Obama made the last time around.

"You see, the man we heard four years ago offering hope and change is the very kind of candidate he was then criticizing. He has become what he criticized," he said at the rally held at Bev's restaurant overlooking the Missouri River.

He added, "All he's doing is basically talking about Mitt Romney. He's trying to distort Mitt Romney's record. He's trying to distract voters to try and win an election by default. We're not going to fall for that are we?"

While Ryan stumped in Iowa, Dr. Jill Biden stopped in Sun Prairie Sunday night.

The wife of the vice president reminded Wisconsinites that early voting begins this week.

She encouraged all to hit the polls early and then to find others who might need help voting. 

"We need all of you, every single one of you, to get out there, to work for us. I know that early voting is tomorrow, Monday, so go out and vote early. Get your friends, get your family, get the people in your churches, and schools and get out there and vote," said Dr. Biden.

Joe Biden's wife will be in Madison Monday morning before heading to Appleton for another campaign stop.