Answer based on context:

The Buccaneers traveled to Denver for the first time since 1996, and lost their second game of the 2008 season. Broncos quarterback Jay Cutler threw for 227 yards and one touchdown. After trading possessions twice to start the game, Tampa Bay drove 65 yards on 7 plays, taking the lead 3-0. On the next possession, Denver managed to tie the score with a 55-yard field goal. Later in the second quarter, Denver made a 9-play drive, capped off by a field goal, and a 6-3 lead. Tampa Bay took over with 2:21 left in the half. Brian Griese drove the Buccaneers in 11 plays to the Denver 11-yard line. As time ran out in the half, Matt Bryant kicked another field goal, and the game was tied 6-6 at halftime. Tampa Bay took the second half kickoff, but was forced to punt. Josh Bidwell pinned the Broncos at their own 4-yard line. On the first play of the drive, however, Cutler connected with Tony Scheffler for 33 yards, and dug themselves out of the hole. The resulting good field possession allowed Denver to punt, and pin Tampa Bay at their own 11. Brian Griese threw an incompletion, and suffered an injured shoulder on the play. Jeff Garcia took over at quarterback. With a short field, Denver drove 47 yards on only five plays, and took the lead again with a 10-yard touchdown pass by Cutler. They followed up with a field goal early in the fourth quarter, and held a 16-6 lead. Late in the fourth quarter, Jeff Garcia drove the Buccaneers 90 yards in 13 plays. The drive was capped off with a 7-yard touchdown pass to Ike Hilliard. The touchdown trimmed the deficit to 16-13. Rather than an onside, Tampa Bay elected to squib kick, and Denver recovered. The Broncos managed two first downs, and ran out the clock to secure the victory.

How many more points did Denver have at halftime?
0