Note before reading:
The Tea Party James Holmes was not involved in this crime by any stretch of the imagination.
The older Tea Party former cop James Holmes seems to have an
online identity called "ldmaster."
A poster in gun trading/advocacy blogs named "ldmaster" owned a glock, a Remington 870, and posts on a web forum called Colorado AR-15 Shooters. The posts concerning the Remington are from an ldmaster in the same county of Colorado as James D Holmes (Tea Party Holmes). These posts are from long before Eagan Holmes arrived in Colorado.
These are, coincidentally, the same type of guns used by James Eagan Holmes in his rampage.
ldmaster also posted comments about gas masks in 2008 as part of a survivalist website forum. This ldmaster claims to be from Aurora, CO.
Judging by ldmaster's online comments, he's likely owned and traded many types of guns over the years, but these were specific examples visible online in his comments with other posters about setting up trades or discussing trades or other posters.
Obviously therefore, this is all information that Eagan Holmes (the gunman) could have found online about the person sharing his name in his town.
The Tea Party James Holmes is evidently a former cop. One blog entry by a Democrat is reporting that Eagan Holmes had a cop shield along with all his other expensive riot gear. A cop shield can be seen near his car in police photos. There only seems to be his gear visible in the shots (ie not mixed in with discarded police equipment they left at the crime scene after apprehending him - which would probably be bad procedure I would imagine.)
The Tea Party James Holmes was not involved in this crime by any stretch of the imagination.
I'm not going to speculate on whether this was more than mere coincidence. Just providing direct raw information in context.