Six months after the signing of President Joe Biden’s $1 trillion infrastructure package, the government said Monday there are 4,300 projects underway with more than $110 billion in funding announced — milestones the administration is publicly heralding as midterm politics intensify. The administration made a strategic calculation that delivering results would help Democrats retain control of the House and the Senate in this year’s elections. Infrastructure was a rare source of bipartisan unity as Biden struck a deal that attracted several Republican senators. The law contains money to expand internet access and replace lead water pipes and for rail and public transit projects and investments to address climate change. Of the $110 billion announced so far, $52.5 billion is for federal highway funding this fiscal year and $20.5 billion for public transit. There is another $27 billion over five years for bridges, as well as money for safety, rural highways, airports, ports, drought resilience and other programs.