Duplicate, or very similar, ideas get created all the time. This causes two problems. People vote for one or the other making it less clear to Marketo just how much we need that functionality. Then, once someone realizes there are two ideas, they try to direct people to pool their votes. There should be an option to flag an idea for merging so that a Marketo administrator can decide whether or not to merge or link the ideas. If so, the comments and votes would be merged as well.
Note that one of the commenters in an idea below suggests this, but it's not a main idea so the Marketo community can't vote.
Duplicate or very similar ideas:
Requests to vote on one vs another:
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