Colorado was part of the Clinton campaign’s initial, general-election advertising campaign. | Getty Clinton campaign pulls ads from Colorado

PHILADELPHIA — Hillary Clinton’s campaign is pulling its television advertisements from Colorado, at least temporarily, after building a sizable and durable lead in the traditional battleground state.

The decision could reflect increasing confidence about Clinton’s chances to capture Colorado’s nine electoral votes in the fall. But a Clinton campaign official, granted anonymity to discuss the campaign's internal operations, stressed the campaign's advertising strategy against Donald Trump will change constantly over the next three months.

Colorado was part of the Clinton campaign’s initial, general election advertising campaign, which began in mid-June and cost at least $22 million. But Monday is the final day of that ad buy.

The Clinton campaign began placing another two weeks of reservations last week, beginning this Tuesday. But this time, it omitted Colorado from the list of target states. The campaign is set to air ads in Florida, Iowa, Nevada, New Hampshire, North Carolina, Ohio, Pennsylvania and Virginia. The buy is worth at least $7.7 million over the next two weeks.

Pennsylvania was added to the initial ad flight last week, in advance of this week’s convention here.

Clinton’s ads have gone mostly unanswered by the Trump campaign over the past six weeks, and the pro-Clinton super PAC Priorities USA Action is still on the air in Colorado. Moreover, the Clinton campaign official stressed that Colorado voters will still see some Clinton advertising as part of the national cable campaign, and some national advertising during the Summer Olympics next month.

Public polls mostly give Clinton a solid advantage in Colorado: POLITICO’s Battleground States polling average shows Clinton with a 7.8 point lead in the state.

National polls point to a possible post-Republican convention bounce for Trump, however. The GOP nominee seized the lead in polls from CNN/ORC International and online pollster Morning Consult. But a CBS News poll showed a tied race after the convention — essentially unchanged from right before the convention.

At a breakfast here Monday hosted by The Atlantic magazine, Clinton pollster and senior strategist Joel Benenson acknowledged Clinton is “stronger in the Sun Belt states” like Colorado than President Barack Obama was in the past two elections.

But pressed by The Atlantic’s Ron Brownstein to break down Clinton’s path in specific battleground states, Benenson demurred: “It would be great for me to stand here and define [the map] when Donald Trump and Paul Manafort are listening, but I don’t think I’ll do that for them.”