Denver, Colorado (CNN) - In Tuesday's primary most Colorado voters did not have to worry about long lines at the polls or to remember to get to the precinct before closing time.
For the first time, a majority of counties in the state, 46 of 64, only used mail-in ballots for a statewide partisan primary. In previous elections, counties could offer the convenience of allowing voters to send in their ballots but could not use that system exclusively.
Officials of the Secretary of State's office could not say right now exactly how many of the more than 735,000 ballots cast in the Senate primaries were mail-in. They will know more when they get specific reports back from each county.
As of Friday, more than 515,000 ballots had been received. In order to be counted, ballots had to arrive at a county election office by 7pm Tuesday. They could either be mailed in dropped off at specific locations. State officials say there was a steady stream of drop offs on Tuesday but not an onslaught.
Approximately 1.5 million ballots were mailed out for the election.
Counties in the state had previously been allowed to use the mail-in system as the sole way only for nonpartisan statewide elections.
Most of the major counties that surround Denver - Araphaoe, Adams, Douglas, Jefferson, Boulder - used the mail-in system only for this primary.
The counties of Weld, which includes Greeley, and El Paso, which includes Colorado Springs, offered in-person voting. Several of the candidates for the Senate seat concentrated some of their last minute encouragement in these areas.
For candidates' get out the vote efforts, however, this new system meant they had to adjust to a new world order. Much of their work these past few days was more devoted to reminding people to mail or drop off their ballots and making sure workers had lists at the ready about locations where they could be deposited instead of reminding people where their polling location was or asking if they needed a ride.
This new system also brought a little bit more uncertainty into the races. Campaign officials were not sure how much a last minute attack or development in the race would affect the outcome since so many people may have cast their choices already.