An article titled "https://www.delmarvanow.com/story/opinion/readers/2018/10/30/mathias-deserves-our-vote-maryland-senate-letter/1748959002/" says:
Mathias has honorably served the Eastern Shore as a public servant for many years. As a mayor, Maryland delegate and now as a Maryland senator, he has won the admiration and respect of all whom he has served, Democrats and Republicans alike.
Here, can you replace the whom with that as follows?
As a mayor, Maryland delegate and now as a Maryland senator, he has won the admiration and respect of all that he has served, Democrats and Republicans alike.
Also, can you omit the relative pronoun as follows?
As a mayor, Maryland delegate and now as a Maryland senator, he has won the admiration and respect of all he has served, Democrats and Republicans alike.
Short answer: no, you cannot replace "whom" with "that" (people are not "thats") and yes, you can drop the relative pronoun (it would be common to do so).
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Short answer: no, you cannot replace "whom" with "that" (people are not "thats") and yes, you can drop the relative pronoun (it would be common to do so).