What is one reason that digital messaging has decreased individual campaign costs?

1. Candidates must get their messages out to a broad audience at one time which will decrease their campaign costs.
2. Twitter allows politically aligned interest groups to run ads.
3. Candidates can use a data exchange which will decrease their individual campaign costs.
4. Google has taken over the cost of campaign for candidates.

3. Candidates can use a data exchange which will decrease their individual campaign costs.