WASHINGTON — Plans by Republicans to dismantle the Affordable Care Act in the first month of Donald Trump’s presidency have sent tremors across Colorado, with activists and accountants both preparing for a seismic shift in policy. Analysts expect that a repeal would have an outsized impact on Colorado, as the state embraced the full spectrum of President Barack Obama’s signature piece of legislation, better known as Obamacare. Related ArticlesJanuary 6, 2017 DaVita CEO lives up to diversity pledge January 5, 2017 Boulder’s Clovis Oncology seeking $205 million through stock offering January 4, 2017 Colorado’s Obamacare exchange misspent $9.7 million in federal grants, audit alleges January 4, 2017 Weigh and Win program expanding in Arapahoe, Douglas counties as resolution season arrives January 4, 2017 Obama, Pence harden ‘Obamacare’ battle lines at Capitol Under the 2010 law, policymakers expanded the number of Coloradans who receive health insurance through Medicaid, created a program for residents to buy coverage through a state exchange and reduced the cost of emergency-room visits by patients without insurance. But the program also was a precursor to new problems, notably the collapse of a nonprofit insurer called Colorado HealthOP — which forced more than 80,000 residents to look for new insurance and wasted an estimated $72 million in federal loans. Critics have blamed the Affordable Care Act for increasing insurance rates for thousands of Coloradans, especially those living in rural parts of the state.