Dense smoke from the wildfire burning in and around Yosemite National Park in California on Saturday hampered both suppression efforts and the prized views sought by holiday weekend tourists. For the first time since the blaze broke out two weeks ago, smoke obscured Yosemite Valley, home to the park's most popular landmarks, spokeswoman Kari Cobb said. Still, all the campgrounds in the valley were full as of Saturday morning, she said. On Friday, a firefighter used a drip torch to set backfires on the southern flank of the blaze to slow it. Fresh firefighters were being brought in to replace tired crews.