Traders work on the floor of the New York Stock Exchange.NYSEStock futures held steady in overnight trading Sunday as investors assessed the outlook for more Covid-19 relief stimulus.Futures on the Dow Jones Industrial Average rose just 20 points. S&P 500 futures and Nasdaq 100 were both little changed.The stock market is coming off a solid week to start 2021 as investors looked past a violent siege of the Capitol and focused on the prospect for additional fiscal stimulus after a Democratic sweep of Congress. The S&P 500 climbed for four days straight to a record with a 1.8% gain last week. The Dow and the tech-heavy Nasdaq Composite gained 1.6% and 2.4% in the prior week, respectively, also reaching all-time highs.”The advance is built on three main pillars: strong corporate earnings, massive stimulus, and vaccine optimism,” Adam Crisafulli of Vital Knowledge said in a note on Sunday. “Stimulus expectations are getting elevated – Biden’s plan may be worth several trillion dollars on paper, but what actually gets passed will probably be much smaller.”President-elect Joe Biden pledged Friday a hefty economic stimulus rollout, which he said will be “in the trillions of dollars.” More details will follow in a formal announcement on Thursday, six days before he is slated to take office.The need for further stimulus was underscored by an unexpected job loss in December. The Labor Department reported Friday that nonfarm payrolls fell by 140,000 as new lockdown restrictions hammered virus-sensitive industries, marking the first monthly drop since April.Political turmoil should continue this week and it remains to be seen when or if the markets will be affected by it. Democrats with the support of some Republicans are moving toward starting impeachment proceedings in the House of Representatives against President Donald Trump as soon as this week for inciting the mob attack. The House Rules Committee is expected to expedite impeachment proceedings without committee hearings or votes. For now the market appears to be looking past it because Congress was able to successfully confirm Biden’s election win and Democrats now in the Senate majority are likely to pursue another big stimulus. If these events start to delay or derail those stimulus plans, traders may start to pay more attention.Some on Wall Street see a pullback on the horizon for the market especially after a surprisingly strong 2020. The S&P 500 gained 16.3% last year.”After being bullish for several months, we are definitely becoming more cautious on the stock market up at these levels,” Matt Maley, chief market strategist at Miller Tabak, said in a note Sunday. “We believe that the vast majority of the rally from the March lows is behind us…and that a correction is likely to begin at some point in the first quarter of this year.”Last week, the benchmark 10-year Treasury yield broke above 1% for the first time since the pandemic-driven turmoil in March.Subscribe to CNBC PRO for exclusive insights and analysis, and live business day programming from around the world.