BOULDER, Colo. -- Some students at the University of Colorado are claiming they were dropped from the voting rolls because of an “obscure, vague” state law.

Student leadership sent out an e-mail Friday to the entire student body telling students to check if they’re registered before the deadline Monday.

With so much focus on the youth vote, the e-mail is getting a lot of attention on campus.

“A lot of us think we’re registered, and we’re not,” said Ida Ghebre, a CU student who said she registered to vote on campus. “Yesterday, I checked the link and I wasn’t registered and I don’t know why.”

UCSU Tri-Executive Ryan Biehle said he kept hearing the same story from various students.

“We wanted to make sure students were aware this could be a problem,” he said.

He believes the problem is because many students don’t have a Colorado driver’s license, so they gave their Social Security number instead, and forgot to check a required box.

“I think this gets to the broader issue of complicated voter registration system that’s out there. In this state, we need voter registration reform,” Biehle said.

A spokesman with the Colorado Secretary of State’s office said it is state law that when people register they must affirm they don’t have a Colorado driver’s license number.

However, if they don’t fully complete the registration form, the county clerk will contact them with a letter, and even though registration ends Monday, those voters actually have until Election Day to correct the information.

Even if they miss that deadline, they can vote on Election Day by using a provisional ballot.

There may be another reason some voters are showing up as not registered.

The Boulder County Clerk’s office said there is a backlog of 4,000 registration forms that have not been entered, yet.

Voters should keep checking on their registration status through Oct. 19 to ensure they are registered.