Is your ultimate goal to create mailing labels?
If so, then yes, enter the info into excel. Note that for a mail merge to work properly, you want each data value to be in its own cell: first name, last name, city, state, zip, etc. each need to be in their own cell/column, otherwise the merge doesn't work too well.
If you want a salutation (Dr./Mr./Mrs.) that needs to have its own column too.
So a properly set up address would look like this:
Mr. | John | Thirties | 569 11th Ave | Glocktown | PA | 90210 |
With each | indicating a new cell/column. Make sense?
The danger to America is not Barack Obama, but a citizenry capable of entrusting a man like him with the Presidency.